Layout Viewer is a Chrome extension designed for frontend developers to easily visualize their web pages across various devices and orientations. This free tool enhances the existing capabilities of Chrome's developer tools by providing a dedicated button that opens a small screen displaying the current tab's user interface in an iframe. Users can select from multiple device types and orientations, making it easier to assess responsiveness without switching between multiple tools.

The extension allows developers to add multiple screens for the same tab, enabling a comprehensive view of how their pages render on different devices simultaneously. Importantly, Layout Viewer does not store or process any data related to the web pages being viewed, ensuring a focus on design without privacy concerns. This streamlined approach makes it an invaluable addition to any frontend developer's toolkit.